She's known for speaking her mind and putting people in their place (Lauren, Jayde, Audrina, the list goes on...). So we got Kristin to spill when it pays to be a little bad.

Love her or hate her, you have to admit that one of the reasons Kristin Cavallari is so much fun to watch is that she can be a bit of a bitch. And we mean that in a good way. Unlike some of the other Hills castmembers, the girl doesn't let anyone walk all over her and she always speaks her mind. So we gave Kristin a few scenarios to see how she'd handle them. Read on for her bitchy little secrets...

Advertisement - Continue Reading Below

The Dilemma: You find out the guy you're hooking up with is secretly talking to his ex.

What Would KCav Do?: She says that lying is her biggest pet peeve and when she finds out someone is being untruthful about one thing, her first thought is, He's probably hiding other things too. "Definitely have a conversation with the guy," she suggests. "Tell him that you heard X, Y, and Z. If he denies it and you know it's true, I'd have to move on." On the other hand, if he fesses up and apologizes, you should go with your gut, according to Kristin, because people eff up, but if they're willing to take responsibility and change, they might deserve a second chance.

More From Cosmopolitan

Oh, but don't go snooping to find juice on the guy, she says. "I don't think you should ever read text messages or emails. Ninety-eight percent of the time, you take it out of context."

The Dilemma: Someone is spreading a nasty rumor about you.

What Would KCav Do?: "Go up to the person and confront them," she says. (Kristin also spilled to us that she does just that in the first episode of the new season. Hint: it has to do with Stephanie and the drug rumors.) "Go right to the source. I actually think that by not confronting the person, you're just adding fuel." Kristin advises against involving others. "Just say, 'I heard from a few different people that you've been saying this,' They don't need to know who."

The Dilemma: Some girl is talking to your boyfriend at a club.

What Would KCav Do?: She recommends keeping a cool head until you have the full story. "If the girl doesn't know he's your boyfriend, it's his fault for not making it clear." In which case she says you should just tell your guy, "This isn't cool and we need to go." If the other woman does know he's attached and your guy is clearly uncomfortable, "tell her she's talking to your man and that she needs to back off. If you've had a word with her and she keeps going, don't make a scene." Kristin says it will only make you look crazy so it's best just to get out of there—with your boyfriend, of course.

The Dilemma: You think your friend's boyfriend is an a-hole.

What Would KCav Do?: "What I love about my friends is that they're brutally honest," she explains. And this is when you should say something, according to Kristin, since there's probably a legit reason you're not a fan. "You don't need to say, 'I hate him', but you can tell her, 'You know, he's not my favorite'."

And One Time NOT to Be a Bitch

The Dilemma: A guy is playing hot and cold with you.

What Would KCav Do?: "Just let it go. I'm a firm believer that if this is the case, he's just not into you," she says. "When a guy wants to see you, he makes time."